Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Opn2NM_14538310090Ops    RP4    MGC21585    MGC25387    Rho    180380
OPN2NM_0005399606RP4    RHO    180380
Opn2BC03176610090MGC21585    MGC25387    RP4    Rho    180380
Opn2BC01312510090MGC21585    MGC25387    RP4    Rho    180380

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002